Modeling of Jharia Coalbed for CO2-ECBM Sequestration

Abstract

Summary CO2-ECBM sequestration in Jharia CBM field is proven to be explicitly significant project in mitigating the rising atmospheric GHGs especially CO2 not only as a potential geological storage in coal matrix also enhancing CH4 production leading to improved gas recovery factor, thereby generating revenue that offsets the expense of sequestration. Modeling of Jharia coalbed for CO2-ECBM sequestration is carried out after analyzing the reservoir complexity. In this modeling, reservoir simulator COMET3 was used to develop a numerical model to simulate the field conditions using data for Jharia coal seam. The production characteristics of the reservoir were made to coincide with the current rate of methane production from coal blocks in this area and the same established model was substituted for injection of CO2 over 2000 days to enhance the production of methane. Numerical simulation results using five-spot pattern well orientation at coal seam have shown an increase of CH4 production by 215% than the usual production by CO2 sequestration. Additionally, CO2 was stored at the maximum injection rate. It is been observed that approximately 204 Mm3 of CO2 can be sequestrated in the area of 56 Mm3 of CH4 produced from the chosen dimensions of coal grid block.